I have a 6 inch fire eel, and lately he hasn't been eating. Someone suggested I get him some pvc pipe to hide in, but he's completely ignored the pipe I bought. I have gravel as the substrate, but the stones are smooth and round, so he's not getting injured by the rocks. I've been feeding him freeze dried blood worms, which he seemed to like at first, but he hasn't been eating at all since I last cleaned the tank. None of the other fish are affected, and the water perams are perfect. The tank is 36 gallons, which is fine for now since he is so small. If I need to be more specific or provide more details, ask me below. I really would like some more advice since I really like this fire eel. I've attached pics of him in case anyone wants to see whether or not he looks healthy